Hdri sky background too close?
Look at this anatomy of an HDRI image:



This is how things will be mapped. So your clouds are mapped below horizon. 

The texture's aspect ratio should be 2:1. Anything else and things will be placed in wrong places unless you correct with mapping vectors (correcting epirectangular mapping could be tricky).

Looks like what you have is just the top hemisphere, but you are mapping it onto both hemispheres. The easiest fix is to edit the image itself and add the bottom by extending the canvas with black.